Traveller on an iPhone

If your phone runs ios12 or above you should be right.

I find it handy for walking, lets you know just how far to top of hill or wherever. But I prefer bigger screen of iPad in car.

Snail trail offers a level of secunity if you worry about getting a bit bushed.

Cheers.

I agree with the previous reply.
I have n iPhone 13 Pro and run it as a backup only with no problem. Prior to that I had it on my iPhone 6S Plus, again without issue.
If your phone is a 2020 SE you will be getting regular Operating System and security updates until about 2026 and then security updates for another 2 years from Apple, as far as I know.
(As an aside Apple phones cost more but are way more secure and work well for much longer than other brands as a result of their supporting them for up to eight years. I believe Samsung, for example, provide OS and security updated for 3 years.)

David

Yep, I have Traveller on both iPad and iPhone, and it works brilliantly on both.
Topo maps are fantastic too.

Cheers
Jim